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                        <span class="pk-color-title">String.length</span>
                        <span class="pk-float-right pk-tip">Core > Object > String > length</span>
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                        <div class="pk-unit-tag">Description</div>
                        <pre>    String.length属性是一个只读的整数，指明指定的字符串string中的字符个数。对任意字符串s来说，最后一个字符的索引都是s.length-1。字符串的length属性不会在for/in循环中枚举，也不可通过delete操作符删除。</pre>
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